Types of mixtures in terms of homogeneity
The matter can be classified into the pure substance and the mixture , where the tea , the juice , the soap , the perfumes , the paints and the blood flowing in our bodies are considered mixtures , The mixtures can be classified in terms of homogeneity into the homogeneous mixtures and the heterogeneous mixtures .
The homogeneous mixtures whose components can not distinguished by the naked eye such as the table salt , the heterogeneous mixtures whose components can be distinguished by the naked eye like the solution of the sand with the water and the solution of the oil with the water .
When you put a spoon of table salt in a glass of water and stir well , You notice that the salt disappears and the water is clear , If you take samples from different parts , You will find that they contain the same percentage of the salt weight .
The mixture of water and salt is homogeneous in all its parts and this is called a solution ( the homogeneous mixture ) , It is known that the solution is made up of the Solvent ( the water ) and the Solute ( the table salt ) , The metal coins are a type of solutions because the coin is an alloy of copper dissolved in silver in a homogeneous form
The solutes are the substances that are found in the solutions with the smaller amounts ( the substances that dissolve on the solvents ) , The solvents are the substances which are found in the solutions with the greater amounts ( the solvent is the substance where the solute is dissolved ) .
The solution is the mixture that is homogeneous in composition and properties and it consists of two substance or more which are not chemically united , All solutions are mixtures ( homogeneous mixtures ) , but not all the mixtures are considered solutions .
The homogeneous mixtures are the mixtures where the solute molecules are regulary distributed in the solvent parts , They are characterized by having the same appearance in all their parts , The heterogeneous mixtures are the mixtures where the solute molecules are irregularly distributed in the solvent parts , They are characterized by having a constant in properties of their parts .
Types of solutions in terms of solute concentration
The solutions are classified according to the concentration of the solute into three types which are the unsaturated solution , the saturated solution , And the super ( pre )-saturated solution .
The unsaturated solution is the solution in which an additional amount of the solute can be dissolved at a certain temperature , The solvent has the ability of dissolving another amount of the solute , The saturated solution is the solution where no additional amount of the solute can be dissolved without a change in the temperature , The solvent has not the ability of dissolving another amount of the solute .
You know that the super-saturated solution can allow the dissolution of the additional amount of the solute with the temperature increase because during heating , the intermolecular spaces between the solvent molecules expand that allow the dissolution of the additional amount of the solute , The amount of the solute is greater than that in case of the saturated solution .